package com.imooc.service.impl;

import com.imooc.service.PayService;
import com.imooc.utils.KeyUtil;
import com.imooc.converter.OrderMaster2OrderDTOConverter;
import com.imooc.dataobject.OrderDetail;
import com.imooc.dataobject.OrderMaster;
import com.imooc.dataobject.ProductInfo;
import com.imooc.dto.CartDTO;
import com.imooc.dto.OrderDTO;
import com.imooc.enums.OrderStatusEnum;
import com.imooc.enums.PayStatusEnum;
import com.imooc.enums.ResultEnum;
import com.imooc.exception.SellException;
import com.imooc.repository.OrderDetailRepository;
import com.imooc.repository.OrderMasterRepository;
import com.imooc.service.OrderService;
import com.imooc.service.ProductService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author Administrator
 * @Title: OrderServiceImpl
 * @ProjectName sell
 * @Description:
 * @date 2018/12/7/00715:00
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private ProductService productService;
    @Autowired
    private OrderDetailRepository orderDetailRepository;
    @Autowired
    private OrderMasterRepository orderMasterRepository;

    @Autowired
    private PayService payService;


    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {

        String orderId = KeyUtil.getUniqueKey();
        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);

        //1. 查询商品（数量, 价格）
        for (OrderDetail orderDetail: orderDTO.getOrderDetailList()) {
            ProductInfo productInfo =  productService.findOne(orderDetail.getProductId());
            if (productInfo == null) {
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIST);
                //throw new ResponseBankException();
            }
            //2. 计算订单总价
            orderAmount=productInfo.getProductPrice().multiply(new BigDecimal(orderDetail.getProductQuantity())).add(orderAmount);

            //订单详情入库
            //copy对象
            BeanUtils.copyProperties(productInfo,orderDetail);
            orderDetail.setDetailId(KeyUtil.getUniqueKey());
            orderDetail.setOrderId(orderId);

            orderDetailRepository.save(orderDetail);


        }
        //写入订单数据库(orderMaster )
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());

        orderMaster.setOrderAmount(orderAmount);

        orderMasterRepository.save(orderMaster);


          //扣库存
       // List<CartDTO> cartDTOList=new ArrayList<>();
        List<CartDTO> cartDTOList=orderDTO.getOrderDetailList().stream().map(e ->new CartDTO(e.getProductId(),e.getProductQuantity())).collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);
        return orderDTO;
    }

    @Override
    public OrderDTO findOne(String orderId) {

        OrderMaster orderMaster=orderMasterRepository.findById(orderId).get();
        if(orderMaster==null ){
            throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
        }

       List<OrderDetail> orderDetailList =orderDetailRepository.findByOrderId(orderId);
        if(CollectionUtils.isEmpty(orderDetailList)){
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        }

      OrderDTO orderDTO=  new OrderDTO();
        BeanUtils.copyProperties(orderMaster,orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);

        return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {

       Page<OrderMaster> page= orderMasterRepository.findByBuyerOpenid(buyerOpenid, pageable);

       List<OrderDTO> orderDTOList=OrderMaster2OrderDTOConverter.convert(page.getContent());

        return new PageImpl<OrderDTO>(orderDTOList,pageable,page.getTotalElements());

    }

    @Override
    @Transactional
    public OrderDTO cancel(OrderDTO orderDTO) {
         OrderMaster orderMaster=new OrderMaster();


        //判断订单状态
        if(!orderDTO.getOrderStatus() .equals(OrderStatusEnum.NEW.getCode())){
                log.error("取消订单,订单状态不存在,OrderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
                throw  new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult=orderMasterRepository.save(orderMaster);
        if (updateResult==null){
            log.error("更新失败,orderMaster={},"+orderMaster);
            throw  new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        //返还库存
        if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList())){
            log.error("取消订单,订单中无商品详情,orderDTO={},"+orderDTO);
            throw  new SellException(ResultEnum.ORDER_DETAIL_EMPTY);
        }

         List<CartDTO> cartDTOList=orderDTO.getOrderDetailList().stream()
                 .map(e->new CartDTO(e.getProductId(),e.getProductQuantity()))
                 .collect(Collectors.toList());
        productService.increaseStock(cartDTOList);

        //如果支付,需要退款
        if(orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS.getCode())){
            payService.refund(orderDTO);
        }

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("[完结订单]订单状态不正确,Orderid={},orderstatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster= new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult=orderMasterRepository.save(orderMaster);
        if (updateResult==null){
            log.error("完结订单更新失败,orderMaster={},"+orderMaster);
            throw  new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {
        //判断订单状态
        if(!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())){
            log.error("[订单支付成功]订单状态不正确,orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //判断支付状态
        if(!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())){
            log.error("[订单支付完成]订单支付状态不正确,orderDTO={}",orderDTO);
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }

        //修改支付状态
        orderDTO.setPayStatus(PayStatusEnum.SUCCESS.getCode());
        OrderMaster orderMaster=new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult=orderMasterRepository.save(orderMaster);
        if(updateResult==null){
            log.error("[订单支付完成]更新失败,orderMaster={}",orderMaster);
                throw  new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(Pageable pageable) {

        Page<OrderMaster> orderMasterPage=orderMasterRepository.findAll(pageable);

        List<OrderDTO> orderDTOList=OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent());

        return new PageImpl<>(orderDTOList,pageable,orderMasterPage.getTotalElements());
    }
}
